Dirt Bikes
Honda - Motocross
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HONDA CRF150R/RB ENGINE/DRIVETRAIN · High-Performance Unicam® cylinder head design · Lightweight, compact, internal auto decompression and handlebar-mounted hot-start system provide easy starting, hot or cold. · Compact, lightweight engine assembly weighs only 43.6 pounds · Crankshaft is made of high-strength, low-carbon steel with carburized main journals for maximum durability at sustained high-rpm operation · Forged 11.7:1-compression slipper piston and rings are lighter than a conventional design, revving quickly while maintaining excellent cylinder sealing and high-rpm power · Double-carburised connecting rod utilises a big-end needle bearing for maximum high-rpm performance and durability · Nikasil cylinder lining is lightweight and provides cooler operation for extended engine life · Press-fitted aluminum spark plug pipe fits between the two exhaust rocker arms, further contributing to compact cylinder-head design · 32mm Keihin FCR carburetor features four rollers on the flat slide, resulting in very light throttle effort, smooth operation, crisp throttle response and excellent rideability · Carburetor features a throttle position sensor (TPS) that helps maintain a linear throttle response throughout the range · Twin-sump lubrication system separates the oil supply for the crankshaft, piston and valve train from the clutch and transmission. This ensures a cool supply of oil to the clutch, eliminates potential clutch and transmission material contamination of the engine oil, reduces the amount of circulating oil and permits the use of a smaller oil pump · Exhaust system uses a lightweight stainless exhaust header and repackable aluminum muffler · Vertically split crankcases feature a built-in oil pump, reducing weight compared to a conventional design · Dual radiators feature a refined core area for improved heat dissipation compared to conventional dual-radiator design · Gear-driven balancer reduces vibration and drives the water pump. A six-disc clutch provides the surface area necessary to handle the engine's impressive torque while carefully matched clutch springs provide a light feel at the lever · Durable close-ratio five-speed transmission CHASSIS/SUSPENSION · Front and rear suspension settings unique to the CRF®150R deliver ideal bump-absorption characteristics · Handlebar bend optimizes rider position and comfort · Lightweight, high-tensile steel frame with large-diameter frame tubing and cross-member provides excellent turning performance and straight-line tracking · Box-section aluminum swingarm is lightweight and rigid · Removable subframe is strong and durable · 37mm leading-axle inverted Showa cartridge front fork features friction-reducing design to improve compression and rebound control · The fork offers adjustable compression and rebound settings · Wide-section aluminum top and bottom triple-clamps position fork tubes far apart for good turning and control · Tapered-roller steering-head bearings for durability · Pro-Link® Rear Suspension · Strong, lightweight wheels are durable and minimize unsprung weight · Lightweight front and rear disc brakes with high-performance pads offer powerful, precise braking · Stout 15mm front and 17mm rear axles incorporate a surface-treatment for added strength and durability ADDITIONAL FEATURES · Large-capacity airbox and reusable two-stage foam air filter · Lightweight plastic body components (radiator shroud, sidecovers, rear fender, seat base, fuel tank, front fender and front number plate) offer a slim, aggressive style · Seat-cushion foam follows the shape of the fuel tank, providing a smooth transition to increase rider mobility and comfort · Non-slip seat cover for increased rider control · High-quality Dunlop tires · HRC works-type rear-brake system integrates the rear master cylinder and fluid reservoir, eliminating the separate rear master-cylinder reservoir and hose · Adjustable front-brake lever · Stainless-steel clutch cable for long life and improved feel and action · Works-type handlebar grips add to rider comfort |
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HONDA CRF250R ENGINE/DRIVETRAIN · All-new compact engine · Liquid-cooled four-valve Unicam® 249cc engine · Engine completely redesigned for improved power delivery from a significantly more compact package that lowers the center of gravity and enhances mass centralization for improved handling · New forged slipper-piston material permits a thinner crown. Low-friction surface treatment ensures high-rev potential · All-new Programmed Fuel Injection system (PGM-FI) utilizes a 50mm throttle body with 12-hole injector fed by lightweight 50-psi pump to ensure optimum fuel atomization and precisely targeted fuel charge. System also improves fuel consumption · PGM-FI system monitors throttle position, intake air and coolant temperatures and manifold pressure to accurately map fuel charge and ignition spark, significantly improving partial-throttle response and helping to ensure excellent rideability · AC generator enlarged to service the PGM-FI system. Two crankshaft position sensors quickly determine crank position to provide quick starts, hot or cold · New mechanical water pump seal improves durability · Kashima coating applied to the clutch basket and clutch center improves clutch life and feel · All-new transmission ratios match engine power output CHASSIS/SUSPENSION · All-new HPSD-equipped Twin-Spar Aluminum Frame with forged-aluminum steering head · Spar height was reduced (70mm to 66mm) and width was narrowed (27mm to 26mm). Stronger downtubes improve front-end feel · Steering response and overall handling were improved by positioning the front wheel 15mm farther back and closer to the crankshaft · Frame, steering head and swingarm modifications permit a reduction in triple-clamp offset (22mm to 20mm) · Removable rear subframe was redesigned to eliminate brackets. Shape altered to improve air filter access and narrow the bike profile · HPSD features a compact damper attached to the lower triple clamp and the steering head to allow more aggressive steering characteristics and assist straight-line handling. Damping action smoothly progresses as handlebar deflection increases, which produces very natural steering characteristics and feel · Pro-Link® Rear Suspension features exclusive Showa integrated reservoir with all-new damping and spring settings · Brake system integrates the rear master-cylinder and fluid reservoir, eliminating the separate reservoir and hose · Link-type front-brake master cylinder and a lightweight brake rotor provide strong braking ADDITIONAL FEATURES · Engine stop switch features an integrated LED pre-ride check indicator. This confirms the PGM-FI system is operating normally · All-new higher-capacity airbox improves filter access · PGM-FI tuning connectors located behind radiator shroud for easier access · Redesigned larger radiators, improve cooling performance · New fuel-tank tether eliminates need to disconnect fuel line to work on top end · Rider ergonomics are optimized by adapting the handlebar, seat and footpeg height to place the rider’s legs at the narrowest part of the frame for improved comfort and handling feel · Adjustable front-brake lever for improved control · Quick-adjust clutch perch for easy cable adjustment · Aluminum Renthal handlebar (971 bend) is rubber-mounted to help reduce rider fatigue and improve comfort |
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HONDA CRF450R ENGINE/DRIVETRAIN · Advanced 4-stroke 4-valve Unicam engine churns out 41.5kW of power at 8,500rpm and 50.3Nm of torque at 7,000rpm. Power is produced across a broad rpm-band for smooth, easy operation · Powerful, liquid-cooled 449.7cc engine pumps out nearly 92.3kW per litre with legendary simplicity and dependability · Lightweight, battery-less fuel injection/ignition system delivers optimal power over a wide, high power range as well as kick-start capability · Fuel injection indicator integrated with engine stop switch shows pre-race conditions of the fuel injection system · Fuel injection system features automatic settings that deliver the same engine character and driveability in differing altitudes · High fuel efficiency allows use of compact and lightweight fuel tank · Thin-walled crankcase casting reduces wall thickness, keeping weight to a minimum · Large-diameter throttle body (50mm) delivers impressive power and performance across the entire range · Innovative Unicam valve train provides both the light weight of a compact single-cam drive and an optimum combustion chamber shape for maximum power at all engine speeds · Unicam valve train features a single carburized camshaft directly actuating two 36mm titanium intake valves. The auto decompressor system executes valve-lifting by causing the decomp pin that is built into the camshaft to push the single rocker arm. This contributes to the overall compactness and light weight of the design by integrating decompressor and camshaft weight · Lightweight titanium intake valves permit use of smaller valve springs, reduce overall engine height and contribute to mass centralisation · Forged slipper piston is lighter than conventional designs, for quick-revving response while maintaining excellent cylinder sealing and high-rpm power · Lightweight Ni-SiC cylinder lining ensures cool, quiet operation for extended engine life · Auto decompression system makes starting easy in all conditions · Plastic fuel pump module attached to bottom face of plastic fuel tank responds directly to fuel pressure and is placed to concentrate mass on motorcycle’s centre of gravity · Twin-sump lubrication system separates oil supply to crankshaft, piston and valve train from clutch and transmission. This enables a reduction of the oil pump size and the amount of circulating oil. It also prevents clutch and transmission material from contaminating engine oil · Exhaust and muffler design achieves low weight, optimal pipe length for the engine and contributes to mass centralisation · Gear-driven balancer reduces vibration while also driving the water pump · Eight-plate clutch provides ample surface area to handle the engine’s massive torque, while carefully matched clutch springs provide a light feel at the lever CHASSIS/SUSPENSION · 5th generation twin-spar aluminium frame is lightweight and provides optimal rigidity for better handling · Slim frame shape features rounded lower parts for extra ground clearance · Revolutionary Ergonomics Design creates open and ‘easy’ ride position. Flat seat to tank area and small tank cap size allow the rider to move from front to rear easily. Sleek, narrow profile from radiator shroud to air box to side panel gives a smooth ride · KYB rear damper and front fork give plush overall feel and better control · Relatively long swingarm, low centre of gravity and wide rear tyre enhance acceleration and traction · Low mass centralisation gives a highly controlled ride feel and makes jumping and manoeuvring in the air easier · Rear frame design incorporates easy under-seat access to air filter · Wheels feature HRC Works-type aluminium spoke nipples for low unsprung weight · Front and rear wheel axles are engineered for light weight and better rigidity · Lightweight, and compliant 48mm inverted fork offers 310mm of suspension stroke, and 16-step rebound and 18-step compression damping adjustability. Front fork outer-tubes receive Kashima coating for low-friction operation · Fully adjustable rear damper provides 320mm of wheel travel, 18-step low-speed and 1.5-turn high-speed compression and 20-step rebound damping · Large 50mm-cylinder-diameter rear damper cushion provides consistent performance under demanding riding conditions · Compact dual-piston front brake caliper and disc are designed for light weight · Link-type front brake master cylinder provides strong braking control in combination with a lightweight brake rotor · HRC Works-type rear brake system integrates the rear master cylinder and fluid reservoir, eliminating conventional external reservoir and hose · Large, Works-style 240mm front and rear disc brake rotors · Frame design allows large air intake ducts in the side covers, enabling significant air flow in the mid and upper-rpm ranges ADDITIONAL FEATURES · HRC settings tool provides an easy-to-use programming system with precise data for setting up the machine to meet all race situations. Ignition timing and fuel mapping settings can be uploaded by connecting the motorcycle to a computer and following simple step-by-step instructions. The system radically simplifies the setup process, making tuning accessible to a wide range of riders · Unique lightweight and compact Honda Progressive Steering Damper (HPSD), developed by Team Honda, improves cornering ability and reduces rider fatigue. More aggressive steering characteristics are augmented while straight-line stability is assisted. The damper’s progressive damping action smoothly increases with handlebar deflection, while producing very natural steering characteristics and feel · Brake pedal and shift lever are made of lightweight aluminium and designed to complement the riding position. Brake pedal features optimised ratio to match integrated rear-brake master cylinder design · Adjustable front brake lever for maximum control · Quick-adjust clutch perch for easy cable adjustment · Wide, cleated stainless steel footpegs are self-cleaning, corrosion-resistant, provide excellent grip and fold for extra ground clearance · Rubber-mounted Aluminium Renthal 971 bend handlebar reduces rider fatigue and improves comfort · Grip design features tapered cushions and deep pre-cut wire grooves for tighter, slip-free wire grip · Handlebar holders provide two different mounting positions to match rider preference · Pirelli SCORPION MX Mid Soft 32 tyres provide improved traction and cornering feel · Front disc brake cover helps to protect rotor and caliper from damage · Removable rear sub-frame allows easy maintenance · Washable, two-stage foam air filter for optimal engine protection and easy maintenance · Re-packable titanium silencer for maximum performance and minimal noise · Comfortable, durable controls and high-quality fasteners · Stainless steel clutch cable for long-life operation · Textured seat sides for extra grip · Slim, aggressively styled plastics allow easy rider movement and feature Honda Racing-inspired colours and graphics |
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